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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="analoaf.html#NM1">OAffinSpace</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>







<b>assume </b><a NAME="E1:40"/>
<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="diraf.html#NR4" target="_self">is_collinear</a> 
 ;<br/>

<b>hence </b><a NAME="E2:40"/>
( <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font> <a href="diraf.html#NR4" target="_self">is_collinear</a>  &amp; <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="diraf.html#NR4" target="_self">is_collinear</a>  )
 <b>by </b><i><a class="txt" href="diraf.html#E43"><i><font color="Green">Lemma25</font></i></a></i>;<br/>

<b>hence </b><a NAME="E3:40"/>
( <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="diraf.html#NR4" target="_self">is_collinear</a>  &amp; <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font> <a href="diraf.html#NR4" target="_self">is_collinear</a>  )
 <b>by </b><i><a class="txt" href="diraf.html#E43"><i><font color="Green">Lemma25</font></i></a></i>;<br/>

<b>hence </b><a NAME="E4:40"/>
<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="diraf.html#NR4" target="_self">is_collinear</a> 
 <b>by </b><i><a class="txt" href="diraf.html#E43"><i><font color="Green">Lemma25</font></i></a></i>;<br/>


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